Automatic electric-circuit-controlling device



said means having an aperture for permit ting the light emitted from the opposite side of said incandescent body to be transmitted through the wall of the envelope.

2. A contact resistance lamp comprising an envelope containing electrodes in contact, means for feeding said electrodes together as they are consumed, and means for enclosing the contacting portions of said electrodes to prevent the deposition of electrode material on predetermined portions of the envelope.

3. An incandescent electric lamp comprising an envelope, a comparatively thin electrode therein, asecond electrode contacting with one side of said first electrode to heat the same to incandescence, a shield interposed between said contacting surfaces and the walls of the container said shield having means for exposing a portion of said first electrode to produce a concentrated continuous light source.

4. A contact resistance lamp comprising an envelope, an electrode in the said envelope, means for preventing the deposition of vaporized electrode material upon the wall of said envelope, another electrode in said envelope and in contact with said first mentioned electrode and mounted to cooperate with said means for preventing the deposition of vaporized material.

5. A contact resistance electric incandescent lamp comprising an envelope, a plurality of electrodes therein, a refractory shield surrounding said electrodes to prevent the deposition of electrode material on the wall of said envelope, one of said electrodes cooperating with said shield to prevent said deposition.

6; An incandescent electric lamp comprising a container, a pair of contacting electrodes within said container, an enclosure for partially surrounding said electrodes to prevent the deposition of vaporized material upon the walls of said container, one of said electrodes cooperating with said enclosure to prevent said deposition, and means for equalizing the pressure on opposite sides of said enclosure.

7. A contact resistance lamp comprising a container, a plurality of electrodes therein having surfaces in contact, means for partially enclosing the contact portions of said electrodes, one of said electrodes coo erating with said means to completely enc ose the said contacting portions, and means for equalizing the pressure at opposite sides of said enclosing means.

In testimony whereof, I have hereunto subscribed my name this 30th day of July, 1924. CHARLES FREDERICK LORENZ.

March 11, 1930. MILLAR 1,749,775

AUTOMATIC ELECTRIC CIRCUIT CONTROLLING DEVICE Filed March 14, 1925 dwvwiw J2 ifygnwzz 

